On the AceKard 2 review by Urza, there is no mention about the performance of the battery life. Has anyone done any tests on the AK2 compared to standard DS Karts or can anyone at least give me a few estimates on how long the battery lasts with the AK2?

Also, does battery life change dramatically with standard firmware and AKAIO?

For months I've been using an R4 that pretty much equals a standard cart in battery life and I've been pleased so far. My AK2 just shipped from DX (I ordered two weeks ago , typical), and should be arriving soon. My 4GB Sandisk MicroSD is waiting.

double capacity batterys are so cheap you may aswell jst get a battery

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Am I required to use one of those cheesy battery covers?

I'm kind of tired of opening up my DS, I just fixed a power switch on my old, broken DSL. Well, it's still old and broken, but it works now. I think opening up the battery slot isn't too big of a deal, though, it's just one screw. I don't want to screw up my good DS that's fairly new.

Battery life is massively dependent on brightness, AGE, wifi, and even what game you are playing.

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True. I think the most reliable and simple way to measure the battery life is leaving the DS playing the Mario Kart intro until it turns off.
People are making comparisons with different brightness, games...

Well, I've just been experimenting with my new AK 2.1, today. Due to testing the PassMe functionality, I left my old G6 (which is known for reducing the battery life) in Slot-2. I was surprised at the poor time I received out of my battery. It was a DS Tank and 10% of the time would have been spent playing with the media players, which could have reduced it. From a near-full charge, I received approximately 4.5 hrs battery life.

Even if I was only using slot one, could having the G6 Lite in Slot-2 have impacted on the battery life?